Skivise (verb); A combination of the words 'skive' (to skip school or work/play truant) and 'revise' (to study for an exam) - to skivise is to skip school or work, in order to revise/study, usually for an important exam.

1.
Boy 1: Is Alex here today?

Boy 2: No, she's skivising, she's got her exams next week.

2.
I have an exam next week, but no free time to study for it - I'll skivise.